Archive | 2021

Lunar Surface Change Detection with PyNAPLE: The 2017-09-27 Lunar Impact Flash and Impact Crater

 
 
 
 
 
 
 
 

Abstract


<p><strong>Abstract</strong></p>\n<p>On 2017-09-27 at 18:56:12 UT a large meteoroid impacted the lunar surface, causing an impact flash with a duration of 1.12 seconds. Using Lunar Reconnaissance Orbiter Camera images, and the PyNAPLE (Python NAC Automatic Pair Lunar Evaluator) software pipeline, the resultant crater was identified. The crater is located at latitude &#966;= 8.0288, longitude &#955; = -76.546, approximately 14km east of the crater Glushko. The asymmetrical morphology of the ejecta blanket indicates the direction of impact was from the south, and impacting incidence angle was <30<sup>o</sup>.</p>\n<p><strong>Introduction</strong></p>\n<p>Lunar impacts are monitored on a regular basis, by both amateur and professional groups [1,2,3]. Since the first confirmed recording of a lunar impact flash in 1999, at least 600 confirmed impact flashes have been observed.</p>\n<p>This large volume of data has let to several studies on both the properties of the impactor, and the thermal evolution of the impact itself [4,5,6]. These studies make use of the observed brightness of the flash, and the most likely parent meteoroid stream to calculate the total energy and temperature of the impact, and estimate the resultant crater size.</p>\n<p>Very few of these impact craters have located [7] however, as finding metre scale craters and linking them to an observed impact with certainty is difficult. By identifying the resultant crater from an observed impact flash, valuable ground truth data can be obtained to help constrain the energy of the impact through use of crater scaling laws. The ejecta pattern of the impact can also tell us important information about the trajectory of the impactor.</p>\n<p>&#160;</p>\n<p><strong>Impact Flash</strong></p>\n<p>At 18:56:10 UT on 2017-09-27, a meteoroid impacted the lunar surface. The impact was observed by SdR UAI Luna members Bruno Cantarella and Luigi Zanatta, using a dual telescope system capturing with ZWO ASI120MM cameras, running at 25fps in one telescope, and 30fps in the other. It was also confirmed to be observed by Stefano Sposetti in Gnosca, Switzerland, ruling out the possibility the flash being a false detection.</p>\n<p>The flash lasted 29 frames in the 25fps camera, giving it a duration of 1.12s. The first 22 frames are shown in Fig. 1. Its peak luminosity is reached in the second frame after only 0.04s, with the peak quantum efficiency of the camera at 590nm.</p>\n<p>&#160;</p>\n<p><img src= data:image/png;base64, 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

Volume None
Pages None
DOI 10.5194/epsc2021-590
Language English
Journal None

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